Consolidated Statements Of Operations And Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Products	$ 83,081	$ 81,883	$ 76,194
Preservation services	62,817	62,758	64,498
Other			71
Total revenues	145,898	144,641	140,763
Cost of products and preservation services:
Products	18,663	17,167	15,147
Preservation services	36,516	36,183	35,230
Total cost of products and preservation services	55,179	53,350	50,377
Gross margin	90,719	91,291	90,386
Operating expenses:
General, administrative, and marketing	74,929	73,754	68,112
Research and development	10,436	8,699	8,454
Total operating expenses	85,365	82,453	76,566
Operating income	5,354	8,838	13,820
Interest expense	(62)	175	71
Interest income	(45)	(50)	(4)
Gain on sale of Medafor investment	(891)	(530)	(12,742)
Other than temporary investment impairment			3,229
Other expense (income), net	484	540	(26)
Income before income taxes	5,868	8,703	23,292
Income tax expense	1,863	1,381	7,120
Net income	$ 4,005	$ 7,322	$ 16,172
Income per common share:
Basic	$ 0.14	$ 0.26	$ 0.59
Diluted	0.14	0.25	0.57
Dividends declared per common share	$ 0.120	$ 0.118	$ 0.108
Weighted-average common shares outstanding:
Basic	27,744	27,379	26,885
Diluted	28,542	28,313	27,698
Other comprehensive income (loss)	$ 45	$ (128)	$ 46
Comprehensive income	$ 4,050	$ 7,194	$ 16,218